Question

If two equilateral triangles are congruent then,
a) their angles are equal
b) their sides are not equal
c) their sides are proportional
d) their sides are not proportional

Answer 1

Hey dear friend

If two equilateral triangles are congruent then, their angles are equal.
Because in equilateral triangle all angles are of 60°.

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Answer 2

a) Their angles are equal is the right answer.

If two equilateral triangles are congruent then their angles are equal.

Congruent Figures :

Those figures which covers each other/one another exactly then they are congruent Figures.

There are 4 ways by which we can prove any 2 triangles as congruent :

If they are having -

★ SSS : Side Side Side

Three pairs of side are equal then the triangles are congruent.

★ ASA : Angle Side Angle / AAS : Angle Angle Side

If any 2 pairs of angles and 1 side are equal then the triangles are congruent.

★ SAS : Side Angle Side

If any two pairs of sides and the included angle are equal then the triangles are congruent.

★ RHS : Right Hypotenuse Side

If any right angle triangles are having their hypotenuse and a pair of sides equal then they are congruent.